Rotary steam-drier



(No Model.)

P. O. HBRSEY. ROTARY STEAM DRIER.

No. 461,577. Patenr ed Oct. 20,1891.

Wifiessas 4, 67M

UNITED STATES PATENT OFFICE.

FRANCIS C. IIERSEY, OF \VELLESLEY, ASSIGNOR TO THE l-IERSEY MANUFAC- TURING COMPANY, OF BOSTON, MASSACHUSETTS.

ROTARY STEAM-DRIER.

SPECIFICATION forming part of Letters Patent No. 461,577, dat d October 1891' Application filed June 9, 1891. Serial No. 395,380. (No model.) I

To all whom it may concern: salt, it may be constructed of wood, having se- Be it known that I, FRANCIS C. HERSEY, a cured to the two ends ringsD E, which are 10- citizen of the United States, and a resident of cated to rest -upon trucks or carriages G H in I \Vellesley, in the county of Norfolk and State order that the machine may turn freely when 5 of Massachusetts, have invented a new and power is applied to rotate it. F is a gear seuseful Improvement in Rotary Steam-Driers, cured to the cylinder, with which the driving of which the following is a full, clear, and exmechanism engages to rotate it. B is an inact description, reference being had to the aeternal heater-cylinder provided with inlet and companying drawings, forming a part of this outlet pipe C, arranged to admit steam as the TO specification, in explaining its nature. apparatus rotates upon its trucks and main- 6o Thisinvention relates to that class of rotary tain a continuous supply, and at the same steam-driers having an external cylinder with time itcarries off the condensed steam from aninternal steam-heating cylinder,and which the interior of the cylinder. at or represent have been the subject of previous .Letters longitudinal buckets or wings secured to the t5 Patent to Charles II. Hersey. interior of the cylinder for the purpose of The object of my invention is to produce a carrying the material from the bottom of the more perfect and rapid drying of those macylinder and showering it upon the internal terials which cannot be subjected to high temheated cylinder. So far as I have described peratures or continuous contactwith highlythese parts are of the regular form and conz heated surfaces without inj ury to them. struction usually adopted in the manufacture The improvements herein set forth are of of these drying apparatus under Letters Patspecial value in the drying of sugar. salt, sand, ent of Charles H. Hersey. and the'like, the first two of which will burn, The improvement which I have invented is scorch, or stick if subjected to contact with the attachment of buckets or wings to the ex- 2 5 highly-heated surfaces for any length of time, terior of the internal steam-cylinder shown at but which at the same time require a certain c c c o. By referring to Figs. 3 and 4 it will be amount of contact with heating-surfaces to seen that these buckets c c c are secured upon procure rapid and effectual drying. In the the cylinder, so that there is a space 6 between latter (sand) too long contact with highlythe buckets and the exterior of the cylinder.

o heated surfaces injures it materially for use These spaces are made by placing washers in the manufacture of mortar or cements. It underneath the buckets or in any other manis for the purpose of more rapidly drying this ner lifting them a slight distance from the kind of material that I have devised the folcylinder. The object of this arrangement is lowing improvements in this class of dryingto retard the material which is being dried.

35 machines. Referring to Fig. 5, it will be seen that the In the drawings, Figure l is a longitudinal buckets in the interior of the outside cylinelevation, partially in section, of a rotary dryder pick up the material that is being dried ing apparatus of the class to which I apply as the-machine rotates and shower it upon the my improvement. Fig. 2 is an end view of internal heated cylinder. Ordinarily the ma-- 4: the same. Fig. 3 is a longitudinal section of terial slides off the cylinder and drops to the one of the buckets, showing its method of atbottom, getting a limited amount of contact tachment to the internal cylinder of the drywith the cylinder, which by very slow operaing apparatus. Fig. 4 is a cross-sectional tion of the drier produces the desired effect; view of a portion of the internal cylinder, but the material to which I have reference 45 showing the method of attachment of the can be dried much more quickly if held in 5 buckets to the cylinder. Fig. 5 is a cross-seccontact for a longer time against the heated tional view of the drier, showing the operacylinder, and yet at the same time not suflition of the material. ciently long to allow it to burn or cake onto In Fig. 1,A is acylinder, preferably of iron, the cylinder. I therefore construct buckets so although in thehandlingofsome material,like upon the internal cylinder, as described, so too that they will retard the material upon the cylinder, allowing it to collect upon the buckets c c c and gradually. slide underneath the buckets to the bottom of the main cylinder, and at the same time it will be thrown off on the opposite side as the cylinder rotates, the object being to retard the material upon the cylinder more or less, according to the number of buckets and the spaces between them.

I have found by actual practice that by this improvement I am able to operate the driers with greater speed than heretofore, eifecting a perfect drying.

The complete operation will be as follows: The material is fed through a chute I into the upper end of the cylinder. As the machine is rotated it gathers the material up by the buckets on the interior of the outside cylinder and showers it through the heated air to the central heater-cylinder, by which it has a retarding contact with the cylinder through the aid of the buckets mounted upon the outside of the cylinder. This operation is contin ued as the machine rotates, and on account of the inclined position of the cylinder the material gradually forwards in the machine and is emptied at the opposite end.

Having thus fully described my invention, what I desire to secure by Letters Patent is 1. A steam drying apparatus composed of a slightly-inclined rotary cylinder provided with buckets or wings secured to its interior and an internal steam-heating cylinder provided with buckets or wings secured to its ex terior, having spaces between the buckets or Wings and the cylinder to which they are attached, and a steam supply and exhaust pipe and anti-friction trucks or carriages arranged to support said drier, substantially as and for the purpose set forth and described.

2. A cylinder for rotary steam-driers having a series of buckets or wings attached to its exterior and having spaces between the buckets or wings and the cylinder to which they are attached, substantially as and for the purpose set forth and described.

FRANCIS G. HERSEY.

\Vitnesses:

J. A. TILDEN, WM. J. SMITH. 

